问题
单项选择题
液压油含空气多，下列现象中：Ⅰ.乳化而润滑性降低、Ⅱ.氧化加快、Ⅲ.使执行元件动作滞后、Ⅳ.透明但颜色变淡、Ⅴ.低压时产生气穴、Ⅵ.锈蚀金属，可能发生的是（）。
A．Ⅱ、Ⅲ、Ⅴ、Ⅵ
B．Ⅲ、Ⅳ、Ⅴ、Ⅵ
C．Ⅰ、Ⅱ、Ⅲ、Ⅴ、Ⅵ
D．全部
答案
参考答案：A
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液压油含空气多，下列现象中：Ⅰ.乳化而润滑性降低、Ⅱ.氧化加快、Ⅲ.使执行元件动作滞后、Ⅳ.透明但颜色变淡、Ⅴ.低压时产生气穴、Ⅵ.锈蚀金属，可能发生的是（）。
A．Ⅱ、Ⅲ、Ⅴ、Ⅵ
B．Ⅲ、Ⅳ、Ⅴ、Ⅵ
C．Ⅰ、Ⅱ、Ⅲ、Ⅴ、Ⅵ
D．全部
参考答案：A
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| Someone says, "Time is money." But I think time is 1 important than money. Why? Because when money is spent, we can get it back. However, when time is 2 , it'll never 3 . That is 4 we mustn't waste (浪费) time. It goes without saying that the 5 is usually limited (有限的). Even a second is very important. We should make full use of our time to do 6 useful. But it is a pity that there are a lot of people who 7 know the importance of time. They spend their limited time smoking, drinking and playing. They do not know that wasting time means wasting part of their own 8 . In a word, we should save time. We shouldn't 9 today's work for tomorrow. Remember we have no time to 10 . | ||||
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